Emerald (1975) from Muzo Mine, Muzo Municipality, Western Boyacá Province, Boyacá Department, Colombia. Comes with certificate of authenticity. Average weight (Carats): 1113.20 carats. Dimensions (mm): 86 x 48 x 42 mm. Ref. : SKU052510. Highly prized in jewelry for its color and rarity, emerald is a mineral from the silicate group, subgroup of cyclosilicates. A green variety of beryl, whose green color comes from traces of chromium, vanadium and sometimes iron, emerald is, with diamond, sapphire and ruby, one of the 4 gems qualified as precious stones. The crystal system of emerald is hexagonal. Emeralds are rare because their formation requires exceptional geological conditions, which are mainly found in Brazil and Colombia.